a cube with a genus of 1

torus.city.json

{
    "CityObjects":
    {
        "id-1":
        {
            "geometry":
            [
                {
                    "type": "Solid",
                    "lod": "1",
                    "boundaries":
                    [
                        [
                            [
                                [
                                    0,
                                    1,
                                    2,
                                    3
                                ],
                                [
                                    4,
                                    5,
                                    6
                                ]
                            ],
                            [
                                [
                                    7,
                                    8,
                                    9,
                                    10
                                ],
                                [
                                    11,
                                    12,
                                    13
                                ]
                            ],
                            [
                                [
                                    0,
                                    3,
                                    8,
                                    7
                                ]
                            ],
                            [
                                [
                                    3,
                                    2,
                                    9,
                                    8
                                ]
                            ],
                            [
                                [
                                    2,
                                    1,
                                    10,
                                    9
                                ]
                            ],
                            [
                                [
                                    1,
                                    0,
                                    7,
                                    10
                                ]
                            ],
                            [
                                [
                                    6,
                                    5,
                                    13,
                                    12
                                ]
                            ],
                            [
                                [
                                    4,
                                    6,
                                    12,
                                    11
                                ]
                            ],
                            [
                                [
                                    5,
                                    4,
                                    11,
                                    13
                                ]
                            ]
                        ]
                    ]
                }
            ],
            "type": "Building"
        }
    },
    "version": "1.1",
    "type": "CityJSON",
    "vertices":
    [
        [
            0,
            0,
            0
        ],
        [
            0,
            1000,
            0
        ],
        [
            1000,
            1000,
            0
        ],
        [
            1000,
            0,
            0
        ],
        [
            200,
            200,
            0
        ],
        [
            700,
            200,
            0
        ],
        [
            500,
            700,
            0
        ],
        [
            0,
            0,
            1000
        ],
        [
            1000,
            0,
            1000
        ],
        [
            1000,
            1000,
            1000
        ],
        [
            0,
            1000,
            1000
        ],
        [
            200,
            200,
            1000
        ],
        [
            500,
            700,
            1000
        ],
        [
            700,
            200,
            1000
        ]
    ],
    "transform":
    {
        "scale":
        [
            0.001,
            0.001,
            0.001
        ],
        "translate":
        [
            0.0,
            0.0,
            0.0
        ]
    }
}